HUGHES PROPRIETARY II1HNS-31689 10/23/2015 STANDARD INTERFACE FOR SATELLITE IP NETWORKS E. Laborde...
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Transcript of HUGHES PROPRIETARY II1HNS-31689 10/23/2015 STANDARD INTERFACE FOR SATELLITE IP NETWORKS E. Laborde...
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HUGHES PROPRIETARY II1HNS-31689 04/20/23
STANDARD INTERFACE FOR SATELLITE IP NETWORKS
E. Laborde
Hughes Network Systems, Inc.
Germantown, MD 20876
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HUGHES PROPRIETARY II2HNS-31689 04/20/23
IPoS Standardization in TIA
• Work on the standardization of DIRECWAY® started August 2002 with the creation of a Working Group within the Satellite Communications Division of the Telecommunications Industry Association (TIA)
• The development of the standard was completed in August 2003 under the name IP over Satellite (IPoS)
• The IPoS ballot period ended October 8, 2003 – The IPoS standard was approved for publication without
any negative votes
• IPoS was published by TIA on November 23, 2003 as the TIA-1008 standard
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HUGHES PROPRIETARY II3HNS-31689 04/20/23
Broadband Access
• Broadband Internet is one of the most commercially successful services offered by telecom operators today
• In general end-to-end IP services are provided to the user by a hierarchy of networks that includes:– An access network
– A metropolitan network
– The core, or backbone network
• Several broadband access networks have evolved for providing mainly IP services to the user:– DSL
– Cable modem
– Satellite
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HUGHES PROPRIETARY II4HNS-31689 04/20/23
Satellite Access Network Issues
• There are a number of issues related to IP satellite access networks:– Sharing the large investment in satellite resources
– Exploiting the temporal fluctuations of traffic demands
– Exploiting the asymmetry of satellite services
– Exploiting the tolerance of IP services to delay
– Provision of a secure environment
– Transparency to higher protocol layers to avoid changes to the user host and Internet routers
– Support of transmission rates comparable to those provided by competing technologies
– Affordable and easy-to-use solutions
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HUGHES PROPRIETARY II5HNS-31689 04/20/23
IPoS Air Interface
• IPoS is the air interface between the remote terminals and the hub in the DIRECWAY satellite access network with a star, hub-and-spoke, topology. The elements in the DIRECWAY network are:– The hub segment consisting of the gateway
interconnecting the satellite access network with the external networks, e.g., Internet, corporate, or private packet networks.
– The space segment typically consists of commercial Ku‑band, bent‑pipe transponders on geosynchronous satellites, allowing transmission in both directions between the gateway and remote terminals.
– The user segment is responsible for interfacing the user hosts or Personal Computers (PC) running the user applications at the customer premises.
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HUGHES PROPRIETARY II6HNS-31689 04/20/23
DIRECWAY Network Architecture
Self-hostedRemoteTerminal
PC-hostedRemoteTerminal
Ku-bandTransponders
Hub Earth Station
Network MgmtCenter
BackendSystems
User PC
Space SegmentUser Segment Hub Segment
LANInterface
TerrestrialInterface
SatelliteInterface
SatelliteInterface
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HUGHES PROPRIETARY II7HNS-31689 04/20/23
IPoS Technical Characteristics
• The IPoS standard defines the interface between remote terminals and gateway; it includes the following features:– A clear separation of satellite-dependent and independent
functions that enables the easy deployment of new applications
– An architectural framework structured into three specific planes: user, control, and management
– A layered protocol stack that separates physical (modulation, coding,..), logical (addressing, MAC headers,..), and procedures (bandwidth allocation, security,..)
– Two directions of transmission:• The outroute direction from the hub to the remote terminals• The inroute direction from the remotes to the hub
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HUGHES PROPRIETARY II8HNS-31689 04/20/23
Protocol Reference Model
SatelliteDependent
SatelliteIndependent
Satellite Link Control (SLC)
Satellite Physical (SPHY)
SI-SAP
ExternalLayers
IPV4 / IPV6
UDP TCP
Satellite Medium Access Control (SMAC)
Other
Satellite Independent Adaptation Functions
Satellite Dependent Adaptation Functions
Applications
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HUGHES PROPRIETARY II9HNS-31689 04/20/23
IPoS Protocol Model
ChannelSelection
Demultiplexer
TrafficProcedures
ControlProcedures
Management
Entity
PHYSICAL LAYER
DLC LAYER
InrouteCarrier
OutrouteCarrier
MACControl
SLCTraffic
TrafficProcedures
ControlProcedures
InrouteProcessing
OutrouteProcessing
MACControl
MACTraffic
MACTraffic
SLCControl
IPoS LogicalChannels
SystemInformation
UPPERLAYERS
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HUGHES PROPRIETARY II10HNS-31689 04/20/23
Outroute MAC Encapsulation
M P E G
H e a d e rD a ta g ra m b yte s
D a ta g ra m
D a ta g ra mCRC
Header
M A C P D U
T ra n sp o rtP a c k e ts
S tu ffin g
b yte s
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HUGHES PROPRIETARY II11HNS-31689 04/20/23
Inroute Framing Structure
0 1 2 3 4 5 6 7
0 1
1 2Superframe
Frame
Slot
Burst
360 msec
45 msec
Number of slots per frame defined in table 3.5.4.1-1
Burst structures are defined in table 3.5.5.2.2-1 through table 3.5.5.2.6-1
45 msec
Burst Length (variable depending on resource allocation)
G-25974 V06/09/03
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HUGHES PROPRIETARY II12HNS-31689 04/20/23
Inroute MAC Encapsulation
IP Datagram
Fragment
PayloadCRC
Header
FragmentFragment
Header
MAC PDU
Burst Payload
Trailer
Header
Header
Header
Adaptation
InrouteTDMA Frame
Slots
1 N
Physical Layer Burst
G-25815 V 04/29/03
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HUGHES PROPRIETARY II13HNS-31689 04/20/23
IPoS Evolution
• The IPoS standard will evolve beyond its current version 01. New versions will incorporate the attributes that are part of the evolution of DIRECWAY:– Ka-band ODU
– Inroute higher transmission rates of 0.5 and 1.0 Msps
– DVD-S2 compatible outroute
– Adaptive coding and modulation (ACM)